Loading air quality context...

Mahiari, nestled in the Purba Bardhaman district of West Bengal, India (22.5900° N, 88.2400° E), occupies a geographically significant position within the Ganges Delta region. The city’s terrain is predominantly flat, characteristic of the fertile alluvial plains formed by the Hooghly River, a major distributary of the Ganges. Mahiari’s elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. The surrounding landscape is a mosaic of agricultural fields – primarily rice and jute cultivation – interspersed with small villages and scattered industrial units. This agricultural belt, while vital for the regional economy, can contribute to air pollution through biomass burning during harvest seasons and fertilizer application. Mahiari’s proximity to the Hooghly River influences local humidity and temperature, impacting atmospheric mixing and dispersion of pollutants. The urban–rural gradient around Mahiari is gradual, with the city acting as a small commercial and transport hub for the surrounding agricultural communities. Further west, the landscape begins to subtly rise, transitioning towards the Chota Nagpur Plateau, though this effect is minimal at Mahiari’s immediate periphery. The prevailing winds, generally from the southwest during the monsoon and shifting to the northeast during the dry season, play a crucial role in transporting pollutants both into and out of the city. The relatively flat topography and low elevation, combined with agricultural practices and limited industrial regulation, create conditions that can exacerbate air quality challenges, particularly during periods of stagnant air.

Mahiari’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants due to frequent rainfall and strong winds that effectively disperse airborne particles. However, the pre-monsoon period (March-May) often witnesses a significant deterioration in air quality. Rising temperatures and decreasing humidity create atmospheric stability, leading to temperature inversions where cooler air is trapped beneath a layer of warmer air, preventing vertical mixing and trapping pollutants near the ground. Agricultural burning, a common practice to clear fields for the Kharif season, contributes significantly to particulate matter pollution during this period. The dry season (October-February) presents a mixed picture. While winds are generally lighter than during the monsoon, they are often sufficient to disperse pollutants, though fog, particularly in December and January, can trap pollutants and reduce visibility. The combination of cooler temperatures and stagnant air during foggy periods can lead to localized air quality concerns. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and foggy periods, limiting outdoor exertion and wearing appropriate masks. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The monsoon months generally offer the most favourable conditions for outdoor activities, although occasional heavy rainfall can still impact visibility and air quality.